Revert of Report lost context from GLES2Implementation based on share group state.

gpu/command_buffer/client/share_group.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_SHARE_GROUP_H_
 #define GPU_COMMAND_BUFFER_CLIENT_SHARE_GROUP_H_
 
 #include <GLES2/gl2.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
-#include "base/synchronization/lock.h"
 #include "gles2_impl_export.h"
 #include "gpu/command_buffer/client/ref_counted.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 
 namespace gpu {
 namespace gles2 {
 
 class GLES2Implementation;
 class GLES2ImplementationTest;
 class ProgramInfoManager;
@@ skipping 115 matching lines @@
     for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
       id_handlers_[i]->FreeContext(gl_impl);
     }
     for (auto& range_id_handler : range_id_handlers_) {
       range_id_handler->FreeContext(gl_impl);
     }
   }
 
   uint64_t TracingGUID() const { return tracing_guid_; }
 
-  // Mark the ShareGroup as lost when an error occurs on any context in the
-  // group. This is thread safe as contexts may be on different threads.
-  void Lose();
-  // Report if any context in the ShareGroup has reported itself lost. This is
-  // thread safe as contexts may be on different threads.
-  bool IsLost() const;
-
  private:
   friend class gpu::RefCountedThreadSafe<ShareGroup>;
   friend class gpu::gles2::GLES2ImplementationTest;
   ~ShareGroup();
 
   // Install a new program info manager. Used for testing only;
-  void SetProgramInfoManagerForTesting(ProgramInfoManager* manager);
+  void set_program_info_manager(ProgramInfoManager* manager);
 
   std::unique_ptr<IdHandlerInterface>
       id_handlers_[id_namespaces::kNumIdNamespaces];
   std::unique_ptr<RangeIdHandlerInterface>
       range_id_handlers_[id_namespaces::kNumRangeIdNamespaces];
   std::unique_ptr<ProgramInfoManager> program_info_manager_;
 
   bool bind_generates_resource_;
   uint64_t tracing_guid_;
 
-  mutable base::Lock lost_lock_;
-  bool lost_ = false;
-
   DISALLOW_COPY_AND_ASSIGN(ShareGroup);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_SHARE_GROUP_H_